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The Department for Communities and Local Government is coordinating the process and facilities allow for 100 samples a day to be tested.

A Number 10 spokeswoman said: "So far, three samples have been found to be combustible."

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She added: "In terms of how many buildings and how many homes have this type of cladding, the estimate provided to us by councils is that there are approximately 600 high-rise buildings with similar cladding.

"We are in touch with all the local authorities to encourage them to urgently send us the samples and then we will carry out the checks that we need to see where we are with that."